chair mechanism 1,make to accept gas lift 2,seat height adjustable 3,any angle tilt lockable chair mechanism1,make to accept gas lift2,seat height adjustable3,any angle tilt lockable Item:HYT-21-A1)Material: Steel2)Plate Thickness: 2.8mm3)Packaging: 6pcs/carton4)Carton size: 46x36x33cm5)N.W.: 3.54kg/pcs